Fireplace, Hearth, Stove
noun
A warm furnace is a furnace for warming you and other things. This is a fireplace or hearth or even a stove.
だんろ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
うちの子がおしっこ漏らしをしちゃって、ズボンを洗ったから、今それを暖炉の前で乾かしているのよ。
My son peed his pants and I washed them, so they’re hanging in front of the fireplace to dry now.